Pretreatment of sulfates before wastewater treatment
Pretreatment of sulfates before wastewater treatment
(OP)
I have a 100 gallon per day batch waste stream that contains residual sulfuric acid (about 5%) and formaldehyde(about 2%). I want to minimize the sulfates going into my biological waste treatment area by pre-treating this stream. I will experiment with raising the pH with soda ash and then making a floc by adding CaCl2. I will then be able to decant the clear supernatant into the bio-treat area (then dispose of the greatly reduced volume of solid residue). Any other cost effective, proven suggestions? Any additives to enhance the floccuating properties? I read some pretty wild economically INfeasible suggestions on these forums, so please make any suggestions practical and not textbook!





RE: Pretreatment of sulfates before wastewater treatment
The vast majority of the sulfate will precipitate out by the time you reach pH 7. You may be able to get [SO4] down to about 810 ppm; see Thread161-50054, although this depends upon temperature and common ion effects, too.